Ventilator



1. STEFAN.' VENTILAIOR, APPLICATION FILED JUNE I9. |919.

Patnted July 6 M2M.

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V.. .E N m T T A .i .TQHNsrnrrnn ornnanv, `conrinerreur.`

` i i Applicatonled .Tune 19,

l To all 'whom t may concern Be it known that I, JOHN Srnrrma citizen of Poland, residing at Derby, county of it i " tor for the cover in which the area of the degree, and

l l j Formed at New Haven, and State of Connecticut, have invented` certain new and usefulllmprovements in ventilators, of which the following is a specification. This invention relates to improvements in ventilators for vessel covers, such as are used `for boiling liquids, and has as its special purpose the; provision of means whereby the vapor rising from the contents of the vessel may be permitted or prevented from passing into the atmosphere. v,

further object is to provide a vent1laopenings may be adjusted to any desired Finally to provide means whereby the movable portion of the ventilator may be resiliently `secured in an adjusted position.

These `and other like objects are attained by the novel construction and combination of parts hereinafter described and shown in the accompanying drawings, forming a material part of this disclosure,` and in whichl l e Figure 1 is a top plan view showing a ventilator made in accordance with the invention.

Fig. 2 is a similar view of the same, parts being shown in another position.

cover comprised of a raised marginal surface 14, and having a depressed central portion 15, the cover being secured `in position by the downwardly flanged rim or edge `16,

suited to make Contact withthe top of the vessel 10. i p

equally spaced intervals through a segmental portion of the `raised marginal edge 14 of the cover areI a plurality i of radially disposed openings 18, and to that portion of the cover through which the openings are formed is secured an arf Specicaton of Letters Patent.

` viinrrta'ron,

1919i. Serial No. 305,449.

cuate sector shaped shutter plate 19, containing in its end extensions 20, elongated slots 21, through which extend pins 22, set 1n the coverplate element 14.

Formed through the shutter plate 19 are a plurality of radial openings 23, coincident with the openings 18 formed in the cover,

and which are registerable therewith by op-V erating an extending actuating knob 25set `rigidly in the center of the shutter plate.

ln order to hold the shutter plate in engagement with the cover a pair of links 26 are pivoted by pins 27 to the central portion 15 of the cover plate, other pins 28 securing the outer ends of the links 26 to the shutter plate, the links being so arranged that the shutter plate may slide limitedly with respect to the cover plate in an obvious manner. e

Formed in the lower side of the shutter plate 19 are recesses 30, and secured in the bottoms of the recesses are springs 31, the

detent ends 32 of which are engageable with corresponding depressions 33, formed inthe upper surface of the cover plate 14: so as to hold the shutter plate in adjustment, at the extreme limits of its travel or central therewith, as shown in Fig. 2, while in Fig. 1 the openings in both cover plate and shutter plate areindicated ,as being in registration. p From the foregoing it will be seen that a cover has been disclosed with which is com bined ventilators through which raport, may be allowed to rise if desired or the openings through the cover may be tightly closed, thereby preventing vapors from rising.

1n operatiomwhen it is desired touse the ventilator, the knob 25 is operated manually so as to slide the shutter plate in the direction desired, to close or open the respective openings formed therethrough.

Having thus described my invention what l claim as new` and desire to secure by lietters Patent is- In a ventilatorof the character described, a circular cover plate having a raised marginal border and a flange extended therefrom adapted to engage with the upper por- ]Patented duly n, 122W.

ings coincident with the openings in said cover plate, pivoted links for holding the cover and lshutter platesl in engagement, plate recessed in its upper face for the repins Vonfsaiclcover plate entering elongated Ception `of the links for holding the shutter slots in said `shutter plates, an actuating plate in its adjusted positions, substantially 10 knob onrsad .shutter plate for'actuating the aS deSCIlbed.

5 same, said shutter plate recessed in' its lower Inl testlmony whereof I have afHXed my side, springs secured in thev bottoms of the Slgllalll'erecesses of said shutter plate, said cover l JOHN STEPIN. 

